[Clang] Add "extend lifetime" flags and release note (#110000) Following the commit that added the fake use intrinsic to LLVM, this patch adds a pair of flags for the clang frontend that emit fake use intrinsics, for the purpose of extending the lifetime of variables (either all source variables, or just the `this` pointer). This patch does not implement the fake use intrinsic emission of the flags themselves, it simply adds the flags, the corresponding release note, and the attachment of the `has_fake_uses` attribute to affected functions; the remaining functionality appears in the next patch. Co-authored-by: Stephen Tozer <stephen.tozer@sony.com>
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